... A site in northeastern Michigan, Oscoda Township, has some of the highest recorded exposure in birds to perfluorinated substances (PFASs) in the United States. Some egg and plasma concentrations at that location exceeded the lowest reproductive effect threshold established for two avian laboratory species. The objectives of this study were to determine whether there were reproductive effects or ph ...

... Solubility and diffusivity measurements of chlorodifluoromethane (HCFC-22) in four ionic liquids (ILs)—[emim][Tf₂N], [bmim][BF₄], [bmim][PF₆], and [emim][TFES]—were conducted using an IGA gravimetric microbalance at temperatures between 283.2 and 348.2 K. The solubility results were modeled using the NRTL activity coefficient method and were also used to calculate Henry’s law constants (kH) at inf ...

... Bench-scale column experiments were performed to evaluate the applicability of employing rapid small-scale column tests (RSSCTs) for the removal of perfluoroalkyl acids (PFAAs) from groundwater, using ground and unground anion exchange resins (AERs). Specifically, experiments were designed to assess the applicability of scaling the overall rate of PFAA uptake to the AERs by r–², where r is the AER ...

... Although long chained PFASs have been phased-out in several countries, their persistence in the environment and bioaccumulative potential cause the environmental and biotic concentrations to remain high, highlighting the need to further monitor these pollutants. Currently several methods are used for the quantification of perfluoroalkyl substances (PFASs) in biological matrices including different ...

... Mechanical operation could be seriously affected by friction and controlling it by oil lubrication has been considered as an effective way. Good lubricant additives are very necessary to avoid the friction damages, and to find or design new additives is always a challenge. In this study, a systematic investigation of using cholesteryl liquid crystals (LCs) as lubricant additives to obtain exceptio ...

... The nature and strength of weak interactions with organic fluorine in the solid state are revealed by periodic density functional theory (periodic DFT) calculations coupled with experimental data on the structure and sublimation thermodynamics of crystalline organofluorine compounds. To minimize other intermolecular interactions, several sets of crystals of perfluorinated and partially fluorinated ...

... Polyfluoroalkylsilanes (PFASis) are a class of artificial chemicals with wide applications in surface coating, which arouse attention due to their hydrophobic/oleophobic properties and potential biological effects. In this study, a robust high-resolution mass spectrometry method through direct injection into a Fourier transform ion cyclotron resonance instrument was established, with the aid of CF ...

... This work details the early events in the reductive defluorination of perfluoroalkyl substances (PFASs) and presents a straightforward methodology for predicting the reduction behavior of the perfluoroalkyl acids (PFAAs) using electronic structure calculations. Electron attachment to linear perfluorocarboxylic acids generally occurs at the α-carbon and is energetically not correlated to chain leng ...

... The diverse morphologies of aggregates formed by the self-assembly of block copolymers in selective solvents have attracted widespread attention, but the design of aggregate shapes is still limited owing to the thermodynamic favorability of sphere formation. In this paper, we report our discovery that polyhedral aggregates can be formed by the self-assembly of 1H,1H,2H,2H-perfluoro-1-dodecanol (PF ...

... The ability to pattern highly conductive features on paper substrates is critically important for applications in radio frequency identification (RFID) tags, displays, sensors, printed electronics, and diagnostics. Ink-jet printing particle-free reactive silver inks is an additive, material efficient and versatile strategy for fabrication of highly conductive patterns; however, the intrinsic wetti ...

... Snow is an efficient scavenger for the deposition of contaminants. Atmospheric transport and snow deposition jointly control the distribution of pollutants in remote mountain/polar regions. But can the contaminants contained within snow be used to reflect the interactions of air circulation patterns? The physicochemical properties of perfluoroalkyl substances (PFASs) are unique because of their hi ...

... We have developed microsized perfluorocarbon (PFC) emulsions with different sizes as artificial oxygen carriers (OCs) via Shirasu porous glass membrane emulsification. Monodispersed PFC emulsions with narrow size distribution were obtained. By changing the membrane pore size, we were able to precisely control the size of emulsions and fabricate emulsions similar in size to human red blood cells. B ...

... While ionomer nanocomposites show promise for advancing the viability of energy storage technologies, such as the vanadium redox flow battery, the improvements in ion selectivity are appreciable only insofar as demonstrating feasibility of these hybrid materials and are largely insufficient for wide-scale implementation of such technologies. This is in part due to our lack of understanding of how ...